Gracefully restart after user interaction

In the first attempt to deploy to office wiki something went wrong and
we manually reverted the moves to seven pages. On restarting the converter
it saw the first move and assumed everything was complete, when it
needed to perform the page move again.

This patch adjusts to only look at the most recent move, rather than any
move by the specified user.

Change-Id: If4287e128448bf9d3a0aa40d18815964371cacd8
(cherry picked from commit de7aa20356d3c4c5e8852b71d84c71a509443c74)